Henry of Nassau, Count of Nassau-Dillenburg (Dillenburg, 15 October 1550 – Mook, 14 April 1574), was the youngest brother of William I of Orange-Nassau.
He was the twelfth and last child of William the Rich and Juliana of Stolberg-Werningerode, and was raised a Lutheran.
He and his brothers William and Louis joined the Huguenot army of Louis I de Bourbon, prince de Condé and took part in the Battle of Moncontour (30 October 1569).
Henry fell in the Battle of Mookerheyde at the age of 23.
This biographical article related to the military of the Netherlands is a stub.